Pick it Pro Balanced cartridge? real balanced? any good?

"Actually both the + and - sides of the cartridge output is what floats."

Probably that is a better way to say what I said.  I certainly don't disagree.

There have been historically a very few cartridges that for example used a single ground for both channels. Those cartridges (Decca, I think, or early Grado) are inherently single-ended and cannot drive a phono stage in balanced mode.  But any cartridge that has two leads, one used for hot and one used for ground in an SE hookup, can also be used to drive a balanced phono stage in balanced mode. So there is nothing unusual about the cartridge in the advertisement, good or bad. In balanced mode, the "hot" lead by convention carries the positive phase of the audio signal, and the "ground" lead carries the negative phase.  Ground floats.